Nonskid cap for bicycle dynamos



W. SANDER NONSKID CAP FOR BICYCLE DYNAMOS Filed Feb. 5, 1958 UNITED STATES PATENT OFFICE NONSKID CAP FOR BICYCLE DYNAMOS Wilhelm Sander, Zwickau, Saxony, Germany Application February 5, 1938, Serial No. 188,967.

In Germany February 25, 1937 1 Claim. (Cl. 74-215) For the light production on bicycles dynamo- The dynamo a is, as usual, hingedly fixed on machines are used, the fluted metallic driving the side of the bicycle, so that for the time when wheel of which contacts on the bicycle tire during electric light is wanted, the metallic driving wheel the time the current for the electric bulb has to can be brought into contact with the outer cover 5 be produced by the rapid rotations. b of the pneumatic tire of the bicycle. In order 5 The metallic driving wheel rubs then on the to avoid the metallically hard action of the drivrubber tire so that the latter is at this point subing wheel, a rubber cap J is stripped in known mitted to wear. Sliding and skidding of the manner over this driving wheel 0, said cap having driving wheel is unavoidable, especially in Wet flutes on the outer and inner side and an inwardly 1o weather, wherefrom results, owing to the irregular turned lower edge d. In order that sufficient macurrent production, flickering of the light, which terial is available for placing the cap on. the drivmight cause accidents if the light on the bicycle ing wheel, the cap has the form of a hood e. If extinguishes suddenly even only temporarily. In the dynamo, which has been adjusted in accordwet, cold weather a smooth ice layer is formed on ance with the slightly enlarged circumference of the driving wheel by the rapid rotations of the the driving wheel is brought into the driving 15 metallic driving wheel so that it must skid on position, the rubber-driving wheel presses intothe rubber tire. The light on the bicycle burns the rubber of the cover of the pneumatic tire and irregularly and, when the driving wheel is worn, rotation of the driving wheel is ensured, as the full exploitation of the source of electric energy resilient pressing-on of the driving wheel can be can never take place so that the light is only regulated as desired without any danger of 29 very feeble. damaging the bicycle, the less so as the non- ,All these inconveniences are obviated according skid cap is absolutely forced to rotate the driving to the invention which consists in a non-skid cap wheel by its internal flutes. of rubber or other suitable material which is I claim:-

fluted in the inner and outer sides and stretched A non-skid cap for the driving wheel on the 25 over the metallic driving wheel, the dynamo being electric dynamo for bicycles, comprising in comaccordingly adjusted on the fork. A lower inbination with the bicycle tire cover and the drivwardly turned edge of the cap then ensures the ing wheel having teeth separated by gaps, a conical cap against slipping off, whereas a hoodfrustro-conical cap of elastic material having in- 30 like head allows to stretch the cap for covering ternal flutes adapted to engage into the gaps 39 the fixat on nut 0n e dr g wheel. The inbetween the teeth of the driving wheel and external flutes engage over the teeth of the driving ternal flutes adapted to engage on said bicycle wheel and act as catches so that slipping of the tire cover, said frustro-conical cap adapted to be cap on the metallic driving wheel is impossible pull-ed over the driving wheel, an inwardly turned even if the l should expand get 0 n t e edge at the lower end of said cap securely hold- 35 course of time. ing the cap on the driving wheel, and allowing The non-skid cap is illustrated on the accomstretching of the cap when it is pulled over the panying drawing in cooperation with the dynamo driving wheel.

and with the bicycle. WILIHIEIIM SANDER. 

